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Fluent Assertions is a set of .NET extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style test. We currently use it in all our internal and client projects, and it is used in many open-source projects. It runs on .NET 4.0, 4.5, 4.6, CoreClr, .NET Native, Windows 8.1, Silverlight 5, Windows Phone 8.0 and UWP. It supports the unit test frameworks MSTest, MSTest2, NUnit, XUnit, MBUnit, Gallio, NSpec and MSpec.

xUnitForms is a xUnit extension for unit and acceptance testing of Windows Forms applications. It makes you easier for writing automated tests for your Windows Forms classes. It's developed in C# 3.5, xUnit 1.1 and referred to NUnitForms.

Chutzpah is an open source JavaScript test runner which enables you to run unit tests using QUnit, Jasmine, Mocha, CoffeeScript and TypeScript. For comments, praise, complaints you can reach me on twitter at @mmanela.

shUnit2 is a xUnit unit test framework for Bourne based shell scripts, and it is designed to work in a similar manner to JUnit, PyUnit, etc.. If you have ever had the desire to write a unit test for a shell script, shUnit2 can do the job. shUnit2 was originally developed to provide a consistent testing solution for log4sh, a shell based logging framework similar to log4j. During the development of that product, a repeated problem of having things work just fine under one shell (/bin/bash on Linux to be specific), and then not working under another shell (/bin/sh on Solaris) kept coming up. Although several simple tests were run, they were not adequate and did not catch some corner cases. The decision was finally made to write a proper unit test framework after multiple brown-bag releases were made. Research was done to look for an existing product that met the testing requirements, but no adequate product was found.

xUnit.net is a free, open source, community-focused unit testing tool for the .NET Framework. Written by the original inventor of NUnit v2, xUnit.net is the latest technology for unit testing C#, F#, VB.NET and other .NET languages. xUnit.net works with ReSharper, CodeRush, TestDriven.NET and Xamarin. It is part of the .NET Foundation, and operates under their code of conduct.

To accomplish that, it massively uses capabilities provided by PHP, to give the developer a whole new way of writing unit tests. Therefore, it can be installed and integrated into an existing project extremely easily, since it is only a single PHAR archive, which is the one and only entry point for the developer. Also, thanks to its fluent interface, it allows for writing unit tests in a fashion close to natural language. It also makes it easier to implement stubbing within tests, thanks to intelligent uses of anonymous functions and closures. atoum natively, and by default, performs the execution of each unit test within a separate PHP process, to warrant isolation. Of course, it can be used seamlessly for continuous integration, and given its design, it can be made to cope with specific needs extremely easily. atoum also accomplishes all of this without affecting performance, since it has been developed to boast a reduced memory footprint while allowing for hastened test execution. It can also generate unit test execution reports in the Xunit format, which makes it compatible with continuous integration tools such as Jenkins. atoum also generates code coverage reports, in order to make it possible to supervise unit tests. Finally, even though it is developed mainly on UNIX, it can also work on Windows. If Xdebug or equivalent gets displayed, then the module is properly installed.

doctest is a new C++ testing framework but is by far the fastest both in compile times (by orders of magnitude) and runtime compared to other feature-rich alternatives. It brings the ability of compiled languages such as D / Rust / Nim to have tests written directly in the production code by providing a fast, transparent and flexible test runner with a clean interface. The framework is and will stay free but needs your support to sustain its development. There are lots of new features and maintenance to do. If you work for a company using doctest or have the means to do so, please consider financial support. Monthly donations via Patreon and one-offs via PayPal.

Cake (C# Make) is a build automation system with a C# DSL to do things like compiling code, copy files/folders, running unit tests, compress files and build NuGet packages. Cake is built on top of the Roslyn compiler which enables you to write your build scripts in C#. It supports the most common tools used during builds such as MSBuild, MSTest, xUnit, NUnit, NuGet, ILMerge, WiX and SignTool out of the box.

MyTested.AspNetCore.Mvc is a unit testing library providing an easy fluent interface to test the ASP.NET Core MVC framework. It is testing framework agnostic so that you can combine it with a test runner of your choice (e.g. xUnit, NUnit, etc.). It is strongly advised to start with the tutorial in order to get familiar with MyTested.AspNetCore.Mvc. Additionally, you may see the testing guide or the API reference for a full list of available features. MyTested.AspNetCore.Mvc is 100% covered by more than 1800 unit tests and should work correctly. Almost all items in the issues page are expected future features and enhancements.

MyTested.WebApi is a unit testing library providing easy fluent interface to test the ASP.NET Web API 2 framework. It is testing framework agnostic, so you can combine it with a test runner of your choice (e.g. NUnit, xUnit, etc.). Inspired by ChaiJS. Please see the documentation for full list of available features. Everything listed in the documentation is 100% covered by more than 800 unit tests and should work correctly. Almost all items in the issues page are expected future features and enhancements.

a simple application which launches NUnit-Console on your Windows Phone unit tests every time you build, using a SilverLight version of NUnit. The output is then colored for better readability: Green bar if success, Red bar if failure.

A unit testing framework for Python based on JUnit and XUnit, the de-facto standard frameworks for Java and SmallTalk respectively. Provides a standard, proven, simple and elegant way to write unit tests for Python software. GUI also provided.

cfix is a xUnit unit testing framework for C and C++, specialized for Win32 and NT kernel mode. The aim of the framework is to make the development of test suites as easy as possible while fully exploiting the services provided by Windows.

TiniUnit is a XUnit-like unit testing framework suitable for use on the Dallas Semiconductors TINI board. TiniUnit is similar the JUnit in intent, but is does not require reflection since the 1.0x version of the TINI OS does not support reflection.